Quack-grass digger.



O. O. NORBY. QuAc'K GRASS messa. APPLlcAnoN man Aua.e` um.

Nr 5 U w if w/T/vfssfs 0. 0. NORBY. QuAcK GRASS BIGGER. APPLICATION FILED AuG..1917l.

Patented June 11, 1918.

2 SHEETS-SHEET 2.

Wl TNESxfS oLAUs 'o. NORBY, or DETROIT,y MINNESOTA.

@UACH-GRASS 'nIGGE-n.

Spe'ci'atio vof Letters Patent.

T0 all whomz't may concern.' l Be, a known that i, oLAUS Io. NORY-,a citizen of theUnit'ed States, residing at Detroit, in Ithe. c''unty of Becker and State of Minnesota, have invented certain new and luseful Improvements in Quack-Grass vDiggers; and Ido hereby declare the following to be a full, clear, and exact description ef the invention, such as will enable others skilled in the art to which it appe'tains to make and usefthe sanie.

My invention 'has for ifts object to provide an improved machine for digging quack grass; and, to this end, it y( io'ns'is'ts of 'novel devices and combinations lof devices hereinafter described and defined in c'la'i'n'is. As isfwe'll known, ordinary if fro'l'indfworking tools used on farms, such as "cultivatois, lwill not destroy quack gras' s, but, on the other hand, will scatter the 'same ver the field, where Ait willtake root, and as 'thesame grows very profusely, valuable vfar-'m lands are very often rendered Ipractically Worthless, ,T he object of m'y ii'n'y'fei'ltion is ito dig up this quack grass Iand deposit the same on top of the ground, where 4it is either Aleft v to be lkilled by the sun or raked up and destroyed.

In jaccompanying 4rdrawinggjs', which illustrate lthe invention, like characters indicate like parts thoughout the several views'.

.Referring'to the drawings:

Figure 1 is a plan View of the improved machine in its preferred form ;y Fig. 2 isa view in vertical section taken on the line removed;

Fig. 3 is a detail view withs'm'e parts sectioned on the line 3-`3lo`f 1; and

Fig. 4 is a plan View lof Ione pair of the toothed disks removed 4from the h arrow.

The numeral 5 indicates a harrow frame having journaled therein two horizontal shafts 6 set at an angle to each other so that their inner ends converge. Telescoped onto each shaft 6 is a plurality of cylindrical body members 7 each of which has tWo axially spaced disks 8. To each of these disks 8 is riveted a plurality of circumferentially spaced curved teeth 9. By reference to Fig. 3 it will be noted that one set of teeth 9 on each body member 7 is set in advance of the other set thereon.

Pivoted to the rear end of the harrow frame 5 for angular steering movement is a frame l0 having on its side members, beara #de `faire jecfzenties 23, are I'ocate'd "in A @wenn with the redder bars 18 and 'cenlngs ing'-joui'nal`ed on its 'outer 'ends a pair of large traction 4wheels 13. To each tractitn Wheel is secured for'rotationy therewith a l'arge lsprocket wheel 1 4, Balanced on'the fr'a'ne 10 directly ever the axle 12 is Va yweizght box 1 5 in which may be'placed stones or other fbjets to give the machine the "deerred weight. Lopsely pvoted on the shaft 12 is a multiplicity offd epe'nding- 'arm's16, havii'ig hubs17 which holdl said arms laterally 'Sac'e'd, 'the proper distanee apart." To vthe lower end of each arm 1 6- is pivote'd the forward end 'of a rearwardly lvextended redderbar 18, and 'te there@ end of *which tedder ba'r intermedately `p'ivoted a tedd'er lever 19, the lower end f whie' is 'curved to forti a tooth 2a ystops 21 en the reader bars 18 ar'e engaged 'by the upper 'endfp'r- 4tions of the tedder levers 19 to hold the 4sai're' in ferwardly AshoWn in yF anc'hlred to the upper 'end vof the ted'der leve'rs 19 vand to the tedderbars 18 ffr yieldinciiaea pesan-sas, as 2 Coiled are trics 23 keyed of which has','its e"r 1`v i'ourendspf vpair of 1inks25, pivoted to 'the -aX-le 12 for-'vertical swinging fnvemm The 'shares 24 and annees-f1.0 which 't 'ley are jeurnaled4separate the ted- 18 in Atwo As Ls'lf'vvn, the

the ysame fve'rtiseated "thereto by @dispel-'ating '-eftnc straps 27 b olted'ytosaid tedder bars.

The shafts 24 Aare Iinl ependently ydriven from the traction wheels 13 by sprocket chains 28 arranged to run over relatively small sprocket wheels 29, loosely mounted Patented June 11,A 11918.

11, in which mounted an axle "1X2, ha'v- The reader bars 1s 'are raised and lowered on the outer ends of said shafts and over the sprocket wheels 14. Clutches 30 are provided for connecting the shafts 24 to the sprocket wheels 29, and the movable members of said clutches have shipper collars 31, which are engaged by shipper levers 32, mounted on the frame 10.

The tedder bars 18 of each group are connected by their respective shafts 24, and each of these groups may be independently raised and lowered by latch levers 33, and conne@- tions comprising a bail 34 and a link 35. The levers 33 are pivoted to cooperating notched segments 36, secured to the weight box 15, and the ends of the bails 34 are pivoted to the intermediate portions of the end members of the groups of tedder bars 18 and have their transverse portions connected by the links 35 to the intermediate portions of the levers 33. Obviously, by operating the levers 33, the depth to which the tedder teeth 20 will enter the ground may be varied at will.

The above described `machine may be drawn either by draft animals or a tractor, and, under the advance movement thereof, the ground will be thoroughly pulverized and the quack grass torn loose by the toothed disks. Following the toothed disks are the tedder teeth 20 which enter the ground and then move backward therethrough to lift the quack grass and throw the same on top of the ground. The eccentrics 23 of each group are set one in advance of the other so that the tedder teeth 20 successively follow each other `in their entrance into the ground and movement therethrough. In case one of the tedder teeth 20 strikes a stone orother obstruction, the respective spring 22 will yield to prevent said tedder finger or connected portion of the machine from being broken or otherwise damaged. `In some conditions of the soil, it might be possible to use only the rear portion of the machine for digging up the quack grass, in which case, the harrow section will be detached. It is also evident that the harrovw section may be used independently of the remaining portion of the machine wheng needed in preparing the soil for seeding.

What l claim is:

1. The combination with a wheel-sup-` ported frame, of a plurality of laterallyspaced tedder bars pivotally connected 'to the frame, with freedom for endwise reciprocating movement, cranks for operating the tedder bars, tedder levers intermediately pivoted to the tedder bars and having toothed lower ends, springs yieldingly hold- Copies of this patent may be obtained for ve cents ing the tedder levers in operative positions, and means for operating the cranks.

2. The combination with a wheel-supported frame, of a plurality of laterallyspaced tedder bars pivotally connected to the frame, with freedom for endwise reciprocating movement, cranks for operating the tedder bars, tedder levers intermediately pivoted to the tedder bars and having on their lower ends depending rearwardly curved teeth, stops for limiting the forward movement of the upper ends of the tedder levers and for holding said levers in forwardly inclined positions, springs for yieldingly holding the tedder levers against said stops, and means for operating the cranks.

3. The combination with a wheel-supported frame, of a plurality of laterallyspaced tedder bars, connected to the frame, with freedom for endwise reciprocating movement, a shaft, vertical swinging links connecting the shaft to the frame, eccentrics on the shaft and cooperating eccentric straps on the tedder bars for operating the same, tedder levers on the free ends of the tedder bars, means for raising and lowering the shaft, and means for driving the shaft.

4:. The combination with a frame, an axle on which said frame is supported, and traction wheels journaled on the axle, of depending arms loosely pivoted on the axle, laterally-spaced tedder bars having their forward ends pivoted to the free ends of the arms, tedder levers on the rear ends of the tedder bars, a horizontal shaft, a pair of links connecting the shaft to the axle, eccentrics on this shaft, and coperating eccentric straps on the tedder bars for operating the same, and connections from the traction wheels to the shaft for driving the i same therefrom.

In testimony whereof l affix my signature in presence of two witnesses.

CLAUS O. NORBY,

Witnesses: y

T. J. SCOTT, ALBEN PnARsoN.

cach, by addressing the Commissioner of Patents,

Washington, D. o. 

